using System.Security.Cryptography;
using System.Text;

namespace AESStu01;

public class AesHelper
{
    // AES加密密钥和向量（需要保密）  
    private static readonly string Key = "";//16长度字符串+数字混合

    private static readonly string IV = "";//16长度字符串+数字混合

    // 加密字节数组  
    public static byte[] Encrypt(byte[] plainBytes)
    {
        using (Aes aesAlg = Aes.Create())
        {
            aesAlg.Key = Encoding.UTF8.GetBytes(Key);
            aesAlg.IV = Encoding.UTF8.GetBytes(IV);

            ICryptoTransform encryptor = aesAlg.CreateEncryptor(aesAlg.Key, aesAlg.IV);

            using (MemoryStream msEncrypt = new MemoryStream())
            {
                using (CryptoStream csEncrypt = new CryptoStream(msEncrypt, encryptor, CryptoStreamMode.Write))
                {
                    csEncrypt.Write(plainBytes, 0, plainBytes.Length);
                    csEncrypt.Close();
                }

                return msEncrypt.ToArray();
            }
        }
    }

    // 解密字节数组  
    public static byte[] Decrypt(byte[] cipherBytes)
    {
        using (Aes aesAlg = Aes.Create())
        {
            aesAlg.Key = Encoding.UTF8.GetBytes(Key);
            aesAlg.IV = Encoding.UTF8.GetBytes(IV);
            ICryptoTransform decryptor = aesAlg.CreateDecryptor(aesAlg.Key, aesAlg.IV);

            using (MemoryStream msDecrypt = new MemoryStream())
            {
                using (CryptoStream csDecrypt = new CryptoStream(msDecrypt, decryptor, CryptoStreamMode.Write))
                {
                    csDecrypt.Write(cipherBytes, 0, cipherBytes.Length);
                    csDecrypt.Close();
                }

                return msDecrypt.ToArray();
            }
        }
    }
}

测试

using AESStu01;

var orginData = new byte[]
{
    1, 2, 3, 4, 5
};
Console.WriteLine("AES加密");
var enData = AesHelper.Encrypt(orginData);
Console.WriteLine("加密后的的数据");
Console.WriteLine(string.Join(",",enData));
var deData = AesHelper.Decrypt(enData);
Console.WriteLine("解密后的的数据");
Console.WriteLine(string.Join(",",deData));